Every fast food order increasing your BMI, experts say

CINCINNATI -- Every hamburger or fried chicken order can cause your body mass index (BMI) to increase by .03 points, according to new research by the department of Public Health Sciences at the University of California.

BMI is based on a person's weight and height. Based on BMI, more than two-thirds of adults in the U.S. are overweight or obese. Researchers in the U.S. and Ireland linked fast food to obesity rates.

Between 1999 and 2008 the average annual number of fast food meals per person increased from 26 to 33, while the average BMI increased from 25.8 to 26.4.

A person with a BMI of 18.5 to 24.9 is considered to be a healthy weight, 25 to 29.9 is considered to be overweight and having a BMI of more than 30 is considered obese.

The results have the World Health Organization calling on governments to make fast food less attractive to consumers.